[Sanitation measures in evidence of Legionella].

Appearance of Legionella disease generally is underrated. Conclusions as to disease frequency from Legionella antibody investigations are not reliable. The number of microbes necessary to produce illness depends from individual preliminary conditions.

[Occurrence and significance of Actinomycetes in drinking water (author's transl)].

Different species of Actinomycetes could be found in the raw-water depending on the origin of the water. The process of water-treatment influenced the total count and the various species in a different mode. Actinomycetes were also isolated from slime which has been formed by microbial growth on PVC coated walls in reservoirs.